/*
 * Copyright 2002-2006 the original author or authors.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
 */

package com.powersi.hygeia.framework.spring;

import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;

/**
 * {@link SqlParameterSource} implementation that holds a given Map of parameters.
 * 
 * <p>
 * This class is intended for passing in a simple Map of parameter values to the methods of the class.
 * 
 * <p>
 * The <code>addValue</code> methods on this class will make adding several values easier. The methods return a reference to the {@link MapSqlParameterSource} itself, so you can chain several method calls together within a single statement.
 * 
 * @author Thomas Risberg
 * @author Juergen Hoeller
 * @since 2.0
 * @see #addValue(String, Object)
 * @see #addValue(String, Object, int)
 * @see #registerSqlType
 */
public class MapSqlParameterSource extends AbstractSqlParameterSource {

    private final Map values = new HashMap();

    /**
     * Create an empty MapSqlParameterSource, with values to be added via <code>addValue</code>.
     * 
     * @see #addValue(String, Object)
     */
    public MapSqlParameterSource() {
    }

    /**
     * Create a new MapSqlParameterSource, with one value comprised of the supplied arguments.
     * 
     * @param paramName
     *            the name of the parameter
     * @param value
     *            the value of the parameter
     * @see #addValue(String, Object)
     */
    public MapSqlParameterSource(String paramName, Object value) {
        addValue(paramName, value);
    }

    /**
     * Create a new MapSqlParameterSource based on a Map.
     * 
     * @param values
     *            a Map holding existing parameter values (can be <code>null</code>)
     */
    public MapSqlParameterSource(Map values) {
        addValues(values);
    }

    /**
     * Add a parameter to this parameter source.
     * 
     * @param paramName
     *            the name of the parameter
     * @param value
     *            the value of the parameter
     * @return a reference to this parameter source, so it's possible to chain several calls together
     */
    public MapSqlParameterSource addValue(String paramName, Object value) {
        // Assert.notNull(paramName, "Parameter name must not be null");
        this.values.put(paramName, value);
        if (value != null && value instanceof SqlParameterValue) {
            registerSqlType(paramName, ((SqlParameterValue) value).getSqlType());
        }
        return this;
    }

    /**
     * Add a parameter to this parameter source.
     * 
     * @param paramName
     *            the name of the parameter
     * @param value
     *            the value of the parameter
     * @param sqlType
     *            the SQL type of the parameter
     * @return a reference to this parameter source, so it's possible to chain several calls together
     */
    public MapSqlParameterSource addValue(String paramName, Object value, int sqlType) {
        // Assert.notNull(paramName, "Parameter name must not be null");
        this.values.put(paramName, value);
        registerSqlType(paramName, sqlType);
        return this;
    }

    /**
     * Add a parameter to this parameter source.
     * 
     * @param paramName
     *            the name of the parameter
     * @param value
     *            the value of the parameter
     * @param sqlType
     *            the SQL type of the parameter
     * @param typeName
     *            the type name of the parameter
     * @return a reference to this parameter source, so it's possible to chain several calls together
     */
    public MapSqlParameterSource addValue(String paramName, Object value, int sqlType, String typeName) {
        // Assert.notNull(paramName, "Parameter name must not be null");
        this.values.put(paramName, value);
        registerSqlType(paramName, sqlType);
        registerTypeName(paramName, typeName);
        return this;
    }

    /**
     * Add a Map of parameters to this parameter source.
     * 
     * @param values
     *            a Map holding existing parameter values (can be <code>null</code>)
     * @return a reference to this parameter source, so it's possible to chain several calls together
     */
    public MapSqlParameterSource addValues(Map values) {
        if (values != null) {
            this.values.putAll(values);
            for (Iterator iter = values.entrySet().iterator(); iter.hasNext();) {
                Map.Entry m = (Entry) iter.next();
                Object k = m.getKey();
                Object o = m.getValue();
                if (o != null && k instanceof String && o instanceof SqlParameterValue) {
                    registerSqlType((String) k, ((SqlParameterValue) o).getSqlType());
                }
            }
        }
        return this;
    }

    /**
     * Expose the current parameter values as read-only Map.
     */
    public Map getValues() {
        return Collections.unmodifiableMap(this.values);
    }

    public boolean hasValue(String paramName) {
        return this.values.containsKey(paramName);
    }

    public Object getValue(String paramName) {
        if (!hasValue(paramName)) {
            throw new IllegalArgumentException("No value registered for key '" + paramName + "'");
        }
        return this.values.get(paramName);
    }

}
